2 * wm8731.c -- WM8731 ALSA SoC Audio driver
4 * Copyright 2005 Openedhand Ltd.
5 * Copyright 2006-12 Wolfson Microelectronics, plc
7 * Author: Richard Purdie <richard@openedhand.com>
9 * Based on wm8753.c by Liam Girdwood
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/spi/spi.h>
26 #include <linux/of_device.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
31 #include <sound/initval.h>
32 #include <sound/tlv.h>
36 #define WM8731_NUM_SUPPLIES 4
37 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
44 /* codec private data */
46 struct regmap *regmap;
47 struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
48 const struct snd_pcm_hw_constraint_list *constraints;
57 * wm8731 register cache
59 static const struct reg_default wm8731_reg_defaults[] = {
72 static bool wm8731_volatile(struct device *dev, unsigned int reg)
74 return reg == WM8731_RESET;
77 static bool wm8731_writeable(struct device *dev, unsigned int reg)
79 return reg <= WM8731_RESET;
82 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
84 static const char *wm8731_input_select[] = {"Line In", "Mic"};
86 static const struct soc_enum wm8731_insel_enum =
87 SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select);
89 static int wm8731_deemph[] = { 0, 32000, 44100, 48000 };
91 static int wm8731_set_deemph(struct snd_soc_codec *codec)
93 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
96 /* If we're using deemphasis select the nearest available sample
101 for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) {
102 if (abs(wm8731_deemph[i] - wm8731->playback_fs) <
103 abs(wm8731_deemph[best] - wm8731->playback_fs))
113 dev_dbg(codec->dev, "Set deemphasis %d (%dHz)\n",
114 best, wm8731_deemph[best]);
116 return snd_soc_update_bits(codec, WM8731_APDIGI, 0x6, val);
119 static int wm8731_get_deemph(struct snd_kcontrol *kcontrol,
120 struct snd_ctl_elem_value *ucontrol)
122 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
123 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
125 ucontrol->value.enumerated.item[0] = wm8731->deemph;
130 static int wm8731_put_deemph(struct snd_kcontrol *kcontrol,
131 struct snd_ctl_elem_value *ucontrol)
133 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
134 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
135 int deemph = ucontrol->value.enumerated.item[0];
141 mutex_lock(&codec->mutex);
142 if (wm8731->deemph != deemph) {
143 wm8731->deemph = deemph;
145 wm8731_set_deemph(codec);
149 mutex_unlock(&codec->mutex);
154 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
155 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
156 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
157 static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0);
159 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
161 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
163 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
166 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
168 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
170 SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv),
171 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
173 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
176 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
177 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
179 SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
180 wm8731_get_deemph, wm8731_put_deemph),
184 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
185 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
186 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
187 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
191 static const struct snd_kcontrol_new wm8731_input_mux_controls =
192 SOC_DAPM_ENUM("Input Select", wm8731_insel_enum);
194 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
195 SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0),
196 SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
197 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
198 &wm8731_output_mixer_controls[0],
199 ARRAY_SIZE(wm8731_output_mixer_controls)),
200 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
201 SND_SOC_DAPM_OUTPUT("LOUT"),
202 SND_SOC_DAPM_OUTPUT("LHPOUT"),
203 SND_SOC_DAPM_OUTPUT("ROUT"),
204 SND_SOC_DAPM_OUTPUT("RHPOUT"),
205 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
206 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
207 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
208 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
209 SND_SOC_DAPM_INPUT("MICIN"),
210 SND_SOC_DAPM_INPUT("RLINEIN"),
211 SND_SOC_DAPM_INPUT("LLINEIN"),
214 static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
215 struct snd_soc_dapm_widget *sink)
217 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec);
219 return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
222 static const struct snd_soc_dapm_route wm8731_intercon[] = {
223 {"DAC", NULL, "OSC", wm8731_check_osc},
224 {"ADC", NULL, "OSC", wm8731_check_osc},
225 {"DAC", NULL, "ACTIVE"},
226 {"ADC", NULL, "ACTIVE"},
229 {"Output Mixer", "Line Bypass Switch", "Line Input"},
230 {"Output Mixer", "HiFi Playback Switch", "DAC"},
231 {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
234 {"RHPOUT", NULL, "Output Mixer"},
235 {"ROUT", NULL, "Output Mixer"},
236 {"LHPOUT", NULL, "Output Mixer"},
237 {"LOUT", NULL, "Output Mixer"},
240 {"Input Mux", "Line In", "Line Input"},
241 {"Input Mux", "Mic", "Mic Bias"},
242 {"ADC", NULL, "Input Mux"},
245 {"Line Input", NULL, "LLINEIN"},
246 {"Line Input", NULL, "RLINEIN"},
247 {"Mic Bias", NULL, "MICIN"},
259 /* codec mclk clock divider coefficients */
260 static const struct _coeff_div coeff_div[] = {
262 {12288000, 48000, 256, 0x0, 0x0, 0x0},
263 {18432000, 48000, 384, 0x0, 0x1, 0x0},
264 {12000000, 48000, 250, 0x0, 0x0, 0x1},
267 {12288000, 32000, 384, 0x6, 0x0, 0x0},
268 {18432000, 32000, 576, 0x6, 0x1, 0x0},
269 {12000000, 32000, 375, 0x6, 0x0, 0x1},
272 {12288000, 8000, 1536, 0x3, 0x0, 0x0},
273 {18432000, 8000, 2304, 0x3, 0x1, 0x0},
274 {11289600, 8000, 1408, 0xb, 0x0, 0x0},
275 {16934400, 8000, 2112, 0xb, 0x1, 0x0},
276 {12000000, 8000, 1500, 0x3, 0x0, 0x1},
279 {12288000, 96000, 128, 0x7, 0x0, 0x0},
280 {18432000, 96000, 192, 0x7, 0x1, 0x0},
281 {12000000, 96000, 125, 0x7, 0x0, 0x1},
284 {11289600, 44100, 256, 0x8, 0x0, 0x0},
285 {16934400, 44100, 384, 0x8, 0x1, 0x0},
286 {12000000, 44100, 272, 0x8, 0x1, 0x1},
289 {11289600, 88200, 128, 0xf, 0x0, 0x0},
290 {16934400, 88200, 192, 0xf, 0x1, 0x0},
291 {12000000, 88200, 136, 0xf, 0x1, 0x1},
294 /* rates constraints */
295 static const unsigned int wm8731_rates_12000000[] = {
296 8000, 32000, 44100, 48000, 96000, 88200,
299 static const unsigned int wm8731_rates_12288000_18432000[] = {
300 8000, 32000, 48000, 96000,
303 static const unsigned int wm8731_rates_11289600_16934400[] = {
307 static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = {
308 .list = wm8731_rates_12000000,
309 .count = ARRAY_SIZE(wm8731_rates_12000000),
313 struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = {
314 .list = wm8731_rates_12288000_18432000,
315 .count = ARRAY_SIZE(wm8731_rates_12288000_18432000),
319 struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = {
320 .list = wm8731_rates_11289600_16934400,
321 .count = ARRAY_SIZE(wm8731_rates_11289600_16934400),
324 static inline int get_coeff(int mclk, int rate)
328 for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
329 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
335 static int wm8731_hw_params(struct snd_pcm_substream *substream,
336 struct snd_pcm_hw_params *params,
337 struct snd_soc_dai *dai)
339 struct snd_soc_codec *codec = dai->codec;
340 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
341 u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
342 int i = get_coeff(wm8731->sysclk, params_rate(params));
343 u16 srate = (coeff_div[i].sr << 2) |
344 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
346 wm8731->playback_fs = params_rate(params);
348 snd_soc_write(codec, WM8731_SRATE, srate);
351 switch (params_format(params)) {
352 case SNDRV_PCM_FORMAT_S16_LE:
354 case SNDRV_PCM_FORMAT_S20_3LE:
357 case SNDRV_PCM_FORMAT_S24_LE:
362 wm8731_set_deemph(codec);
364 snd_soc_write(codec, WM8731_IFACE, iface);
368 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
370 struct snd_soc_codec *codec = dai->codec;
371 u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
374 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
376 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
380 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
381 int clk_id, unsigned int freq, int dir)
383 struct snd_soc_codec *codec = codec_dai->codec;
384 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
387 case WM8731_SYSCLK_XTAL:
388 case WM8731_SYSCLK_MCLK:
389 wm8731->sysclk_type = clk_id;
397 wm8731->constraints = NULL;
400 wm8731->constraints = &wm8731_constraints_12000000;
404 wm8731->constraints = &wm8731_constraints_12288000_18432000;
408 wm8731->constraints = &wm8731_constraints_11289600_16934400;
414 wm8731->sysclk = freq;
416 snd_soc_dapm_sync(&codec->dapm);
422 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
425 struct snd_soc_codec *codec = codec_dai->codec;
428 /* set master/slave audio interface */
429 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
430 case SND_SOC_DAIFMT_CBM_CFM:
433 case SND_SOC_DAIFMT_CBS_CFS:
439 /* interface format */
440 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
441 case SND_SOC_DAIFMT_I2S:
444 case SND_SOC_DAIFMT_RIGHT_J:
446 case SND_SOC_DAIFMT_LEFT_J:
449 case SND_SOC_DAIFMT_DSP_A:
452 case SND_SOC_DAIFMT_DSP_B:
459 /* clock inversion */
460 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
461 case SND_SOC_DAIFMT_NB_NF:
463 case SND_SOC_DAIFMT_IB_IF:
466 case SND_SOC_DAIFMT_IB_NF:
469 case SND_SOC_DAIFMT_NB_IF:
477 snd_soc_write(codec, WM8731_IFACE, iface);
481 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
482 enum snd_soc_bias_level level)
484 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
489 case SND_SOC_BIAS_ON:
491 case SND_SOC_BIAS_PREPARE:
493 case SND_SOC_BIAS_STANDBY:
494 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
495 ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
500 regcache_sync(wm8731->regmap);
503 /* Clear PWROFF, gate CLKOUT, everything else as-is */
504 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
505 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
507 case SND_SOC_BIAS_OFF:
508 snd_soc_write(codec, WM8731_PWR, 0xffff);
509 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
511 regcache_mark_dirty(wm8731->regmap);
514 codec->dapm.bias_level = level;
518 static int wm8731_startup(struct snd_pcm_substream *substream,
519 struct snd_soc_dai *dai)
521 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(dai->codec);
523 if (wm8731->constraints)
524 snd_pcm_hw_constraint_list(substream->runtime, 0,
525 SNDRV_PCM_HW_PARAM_RATE,
526 wm8731->constraints);
531 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
533 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
534 SNDRV_PCM_FMTBIT_S24_LE)
536 static const struct snd_soc_dai_ops wm8731_dai_ops = {
537 .startup = wm8731_startup,
538 .hw_params = wm8731_hw_params,
539 .digital_mute = wm8731_mute,
540 .set_sysclk = wm8731_set_dai_sysclk,
541 .set_fmt = wm8731_set_dai_fmt,
544 static struct snd_soc_dai_driver wm8731_dai = {
545 .name = "wm8731-hifi",
547 .stream_name = "Playback",
550 .rates = WM8731_RATES,
551 .formats = WM8731_FORMATS,},
553 .stream_name = "Capture",
556 .rates = WM8731_RATES,
557 .formats = WM8731_FORMATS,},
558 .ops = &wm8731_dai_ops,
559 .symmetric_rates = 1,
563 static int wm8731_suspend(struct snd_soc_codec *codec)
565 wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
570 static int wm8731_resume(struct snd_soc_codec *codec)
572 wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
577 #define wm8731_suspend NULL
578 #define wm8731_resume NULL
581 static int wm8731_probe(struct snd_soc_codec *codec)
583 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
586 codec->control_data = wm8731->regmap;
587 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_REGMAP);
589 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
593 for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
594 wm8731->supplies[i].supply = wm8731_supply_names[i];
596 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
599 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
603 ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
606 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
607 goto err_regulator_get;
610 ret = wm8731_reset(codec);
612 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
613 goto err_regulator_enable;
616 wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
618 /* Latch the update bits */
619 snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
620 snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
621 snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
622 snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
624 /* Disable bypass path by default */
625 snd_soc_update_bits(codec, WM8731_APANA, 0x8, 0);
627 /* Regulators will have been enabled by bias management */
628 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
632 err_regulator_enable:
633 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
635 regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
640 /* power down chip */
641 static int wm8731_remove(struct snd_soc_codec *codec)
643 struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
645 wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
647 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
648 regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
653 static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
654 .probe = wm8731_probe,
655 .remove = wm8731_remove,
656 .suspend = wm8731_suspend,
657 .resume = wm8731_resume,
658 .set_bias_level = wm8731_set_bias_level,
659 .dapm_widgets = wm8731_dapm_widgets,
660 .num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
661 .dapm_routes = wm8731_intercon,
662 .num_dapm_routes = ARRAY_SIZE(wm8731_intercon),
663 .controls = wm8731_snd_controls,
664 .num_controls = ARRAY_SIZE(wm8731_snd_controls),
667 static const struct of_device_id wm8731_of_match[] = {
668 { .compatible = "wlf,wm8731", },
672 MODULE_DEVICE_TABLE(of, wm8731_of_match);
674 static const struct regmap_config wm8731_regmap = {
678 .max_register = WM8731_RESET,
679 .volatile_reg = wm8731_volatile,
680 .writeable_reg = wm8731_writeable,
682 .cache_type = REGCACHE_RBTREE,
683 .reg_defaults = wm8731_reg_defaults,
684 .num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults),
687 #if defined(CONFIG_SPI_MASTER)
688 static int wm8731_spi_probe(struct spi_device *spi)
690 struct wm8731_priv *wm8731;
693 wm8731 = devm_kzalloc(&spi->dev, sizeof(struct wm8731_priv),
698 wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
699 if (IS_ERR(wm8731->regmap)) {
700 ret = PTR_ERR(wm8731->regmap);
701 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
706 spi_set_drvdata(spi, wm8731);
708 ret = snd_soc_register_codec(&spi->dev,
709 &soc_codec_dev_wm8731, &wm8731_dai, 1);
711 dev_err(&spi->dev, "Failed to register CODEC: %d\n", ret);
718 static int wm8731_spi_remove(struct spi_device *spi)
720 snd_soc_unregister_codec(&spi->dev);
724 static struct spi_driver wm8731_spi_driver = {
727 .owner = THIS_MODULE,
728 .of_match_table = wm8731_of_match,
730 .probe = wm8731_spi_probe,
731 .remove = wm8731_spi_remove,
733 #endif /* CONFIG_SPI_MASTER */
735 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
736 static int wm8731_i2c_probe(struct i2c_client *i2c,
737 const struct i2c_device_id *id)
739 struct wm8731_priv *wm8731;
742 wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv),
747 wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);
748 if (IS_ERR(wm8731->regmap)) {
749 ret = PTR_ERR(wm8731->regmap);
750 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
755 i2c_set_clientdata(i2c, wm8731);
757 ret = snd_soc_register_codec(&i2c->dev,
758 &soc_codec_dev_wm8731, &wm8731_dai, 1);
760 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
767 static int wm8731_i2c_remove(struct i2c_client *client)
769 snd_soc_unregister_codec(&client->dev);
773 static const struct i2c_device_id wm8731_i2c_id[] = {
777 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
779 static struct i2c_driver wm8731_i2c_driver = {
782 .owner = THIS_MODULE,
783 .of_match_table = wm8731_of_match,
785 .probe = wm8731_i2c_probe,
786 .remove = wm8731_i2c_remove,
787 .id_table = wm8731_i2c_id,
791 static int __init wm8731_modinit(void)
794 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
795 ret = i2c_add_driver(&wm8731_i2c_driver);
797 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
801 #if defined(CONFIG_SPI_MASTER)
802 ret = spi_register_driver(&wm8731_spi_driver);
804 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
810 module_init(wm8731_modinit);
812 static void __exit wm8731_exit(void)
814 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
815 i2c_del_driver(&wm8731_i2c_driver);
817 #if defined(CONFIG_SPI_MASTER)
818 spi_unregister_driver(&wm8731_spi_driver);
821 module_exit(wm8731_exit);
823 MODULE_DESCRIPTION("ASoC WM8731 driver");
824 MODULE_AUTHOR("Richard Purdie");
825 MODULE_LICENSE("GPL");